lanar SOFCs, in contrast, are capable of achieving very high power
densities of up to about 2 W/cm2
.
In the planar design, illustrated in
Figure 2 in its most generic version, the cell components are
configured as thin, flat plates. The interconnection, which is ribbed
on both sides, forms gas flow channels and serves as a bipolar gas
separator contacting the anode and the cathode of adjoining cells.
The cells are fabricated by low-cost conventional ceramic processing
techniques such as tape casting, slurry sintering, screen printing, or
by plasma spraying. Different organizations have developed several
different variations of the planar design and use different
manufacturing processes. In electrolyte-supported cells, the thickness
of the electrolyte, typically yttria-stabilized zirconia (YSZ), is 50 to
150 µm, making their ohmic resistance high, and such cells are
suitable for operation at ∼1000°C. In electrode-supported designs,
the electrolyte thickness can be much lower, typically 5 to 20 µm,
which decreases their ohmic resistance and makes them better suited
for operation at lower temperatures (∼800°C). Lower temperature
operation results in less degradation of cell and stack components,
makes feasible use of inexpensive metallic interconnects, is less
demanding on seals, and aids in faster heat up and cool down. The
anode (Ni/YSZ cermet) is selected as the supporting electrode,
because it provides superior thermal and electrical conductivity,
superior mechanical strength, and minimal chemical interaction with
the electrolyte. Kim et al6 have reported power densities as high as
1.8 W/cm2
at 800°C for such anode-supported SOFCs
lanar SOFCs, in contrast, are capable of achieving very high powerdensities of up to about 2 W/cm2. In the planar design, illustrated inFigure 2 in its most generic version, the cell components areconfigured as thin, flat plates. The interconnection, which is ribbedon both sides, forms gas flow channels and serves as a bipolar gasseparator contacting the anode and the cathode of adjoining cells.The cells are fabricated by low-cost conventional ceramic processingtechniques such as tape casting, slurry sintering, screen printing, orby plasma spraying. Different organizations have developed severaldifferent variations of the planar design and use differentmanufacturing processes. In electrolyte-supported cells, the thicknessof the electrolyte, typically yttria-stabilized zirconia (YSZ), is 50 to150 µm, making their ohmic resistance high, and such cells aresuitable for operation at ∼1000°C. In electrode-supported designs,the electrolyte thickness can be much lower, typically 5 to 20 µm,which decreases their ohmic resistance and makes them better suitedfor operation at lower temperatures (∼800°C). Lower temperatureoperation results in less degradation of cell and stack components,makes feasible use of inexpensive metallic interconnects, is lessdemanding on seals, and aids in faster heat up and cool down. Theanode (Ni/YSZ cermet) is selected as the supporting electrode,because it provides superior thermal and electrical conductivity,superior mechanical strength, and minimal chemical interaction with
the electrolyte. Kim et al6 have reported power densities as high as
1.8 W/cm2
at 800°C for such anode-supported SOFCs
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